I do not think testing and typing are "mutually exclusive". But one of the "pros" people keep pitching about Typescript is the "code as documentation" and "less error" talking point, which I think is already achieved by having proper unit tests whether the language is typed or not.
I could be biased here, but just talking about this specific "merit" Typescript can give is not convincing to me. It could be also due to working style, because I tend to write very thorough unit test coverage (~98% across the projects I developed in the past few years).
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